The King of Hell Wanted Me To Work In The Underworld

Fujioka Kaen is just living his daily life as usual, playing games on his Switch while lying down on the bed and eating chips. When suddenly, a hole open below him and he fell right into it.

"Ow! What the--!" he scratches his head, eyes following a shadowy figure imposing him.

"Greeting, my descendant!" the giant creature says with booming voice.

"...What?"

"I welcome you, to the underworld. My domain," Two pairs of horns shining under the scorching flames.

"What?"

"It is a surprise, seeing one of my kin having such strong mana concentration while living for so long in the living world. Why, I ought to use it for my benefit! That's why I asked you take care part of the underworld for me," crimson eyes smiles devilishly. His wings spread proudly and his tail swinging lazily.

"WHAT?"

And that's how, Fujika Kaen, who just found out he's related to the King of Hell, is forced to work in the underworld. Helped by the residence living in it, can he survive working here while balancing his life on earth?